Why does the Bible not mention Russian or German emperors or the kingdom of Great Britain in prophecy?
Those nations are absent from prophecy because they were not centered on the nation of Israel. The prophetic kingdoms in Daniel were each intricately involved with the Jew, so they come into prophecy. Empires like Russia, Germany, and Great Britain lacked that Israel-centered relationship, so Scripture does not name them in this prophetic sequence.
Les explains that the reason you do not read about any great Russian emperor or a German emperor, and do not read about the kingdom of Great Britain, is that they were not centered with the nation of Israel. By contrast, the kingdoms that come on the scene in the book of Daniel were all intricately involved with the Jew, and so they come into prophecy. Daniel then introduces Babylon: in the third year of the reign of Jehiakim, king of Judah, Nebuchadnezzar, king of Babylon, came to Jerusalem and besieged it; the Lord gave Jehiakim into Nebuchadnezzar's hand, along with part of the vessels of the house of God, which he carried to the land of Shinar, back to Babylon. Les notes those vessels from the beautiful temple were taken to Babylon, and he suggests they were probably not used until Belshazzar's drunken feast, followed by the handwriting on the wall. Since Daniel is now into the area of the Gentile empires, Les takes listeners to Luke chapter 21 before continuing.